The game displays a password after it has been completed (for example, 92445276, 25774450, 92886423, etc.). This password is to change your deck. After you enter the password, check your cards.

Password mode

On every Duel Monsters card is an eight-digit password on the lower left corner directly below the card's picture. Enter this code at the "Password" option on the main screen, and the card will be recorded into your card collection. Note: You can only enter the password once.

Duplicating cards

Three memory cards are required for this trick. One can be a PlayStation 2 memory card if needed. Refer to the memory cards as A, B, and C. Insert memory cards A and C. Memory card A should have the cards you want to duplicate. Copy the Yu-Gi-Oh Forbidden Memories saved game file to memory card C. Start a game and insert memory card B. This memory card be should also have a game in it with a different I.D. Trade the cards that you want from memory card A to memory card B, then reset the game. Return to the PlayStation memory manager and copy the saved game file from memory card C and put it back in memory card A. Memory card A should now have your old file with all the cards that you traded to memory card B. Next, go to trade and put all the cards you traded to memory card B into memory card A. If done correctly, you should have doubled the cards that you wanted.

The following trick gives you extra cards for free without dueling or using starchips. You need two memory cards. Refer to the memory cards as A and B. Memory card A must have a save file on it. Insert memory card B into memory card slot one and start a new game. Save that game to memory card B, then reset the game. Go to the build deck menu and take all the cards you want out of your deck and exit the menu. Save your game and reset the PlayStation. Insert memory card A into memory card slot two. Go into the trade menu and select all the cards (or as many as you can) from memory card B and press Square on controllers one and two. A menu will appear. Press X to select "Trade", then "Yes". You will now have all the cards from memory card B (that you traded) in memory card A.

3D Battle Arena

To get to the 3D Battle Arena, press X on one of your monsters, then press Square instead of using X to attack again.

Duel monsters profile

Load your game then go to the library. Press X on any duel monster. You will now see its profile. To see it in live action press Right. Also, go into the library and look for a monster that you want to see. Wait for a arrow pointing left in the bottom left corner. To go back, it will be in the right.

After you win, go right, right, left, right. Then, you save Tea and fight two opponents before Keishin. Then Seto appears and the end is Darknite.

Exodia

Enter the following passwords:

Head: 33396948

Right Leg: 08124921

Left Leg: 44519536

Left Arm: 07902349

Right Arm: 70902349

Summoned Skull power-ups

The following things can be used to power up the Summoned Skull card:

Sword of Dark Destruction

Malevolent Nuzzler

Black Pendant

Bright Castle

BeastFangs

Horn of the Unicorn

Dark Energy

Kunai with chain

Black Pendant

Sword of Dark Destruction

Axe of Despair

Fighting Simon Muran

At the beginning of the game, Simon talks to you. You will have options to listen or run away. This is what he will do on each condition:

Run Away: When you return, you will go straight to your room.

Listen, Run Away: When you return, you will have a chance to duel with Simon Muran.

Listen, Listen, Run Away: When you return, you will go straight to your room.

Listen, Listen, Listen: You will go straight to your room.

Card passwords

At the title screen, select the "Load Game" option, then choose the "Password" selection and enter one of the following passwords to unlock the corresponding card. Note: You will need a certain amount of Starchips to get the cards when using the following passwords.